HVAC, Appliance, CNC, and VFD Error Code Repair Guides
Browse repair guides for HVAC, appliances, refrigeration, CNC alarms, VFD faults, generators, boilers, water heaters, and commercial equipment.
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Haas Alarm 112 — Motor Overtemp
What Haas CNC alarm 112 means, why a servo motor overtemperature occurs, and how to diagnose and fix it.
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Heidenhain Error Code 399 Servo Error — Causes & Fix
What Heidenhain TNC 640 error code 399 means, why a servo error occurs, and how to diagnose and recover the axis.
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Hoshizaki E9 Error Code — Causes & Fix
What Hoshizaki E9 error code means, why the evaporator temperature sensor faults, and how to diagnose and fix it.
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Hydrotherm Boiler E1 Error Code - Ignition Failure Lockout
Hydrotherm boiler E1 means ignition failure. Check the flame sensor, gas supply, spark electrode, combustion air, exhaust venting, and gas valve.